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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '33825e91dcb0c0a760fcd146d8f7257184c83ebc1448464cfb424632f97c01a5' 
  AND token = '0KTtIn3RVeRohv42W6FBi1Z72bPF/FU6qaNlPOiaWZs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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