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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ab0ce3ed8d09dbee2bea868d1930bff2aa261bd655fbb402e10d4a77a6a88e11' 
  AND token = 'C9t98NXRRcmhFk3LE8HUaIXOk3RfKhCvtb91aaphAuk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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