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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7b77519f850c453356b52b27d839d91806b797926f85a1a0b7a8be65ede9114e' 
  AND token = 'RyTn1o0G28+NIThunaKj8ijpjqA2vgy0ObaykUcwfK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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