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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b57488c4835022f0452c05a94286cdfb169482ca286e0cec08a4f3e1025b7bac' 
  AND token = 'e5a4bhuOBgS3k8Y7htPq2R9Iuu6eFUalEqVOoHBbXBw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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