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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '10519cdd2acf639b939d9b50d5641aa94be75ae5a49f350b5fc8cf7be4995ec2' 
  AND token = 'dKxTe1zatUgRZ9UsAFxbjvO9Hn4LsyZB0Ff33hhdLkQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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