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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '58abb740e79d5efd4d505730dbff21f1adfdf81cd44b0f5150237e09dda1d9e1' 
  AND token = 'WzY0yXq9FeqCDD3dsbGS3rSE8urL3YvIoL8NpU4IKY8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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