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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8f9fdc1a54831f56e65dc8b7003dfd777f5eff5a11a1ba1c77bd8d7cc47f8ba3' 
  AND token = 'R9f/YqaD344raYUZeGwbS/2xCFZ2fW5yoagtBjC1jyM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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