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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1eb4615482844003af74de05683c29daa9130c2064a2f315d18551de464c6633' 
  AND token = 'Ot3g4e8qDRBy9c3v2KCca4KYc7oRa4YJ3RBLLErftDA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}