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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4725a3289cf582267b2da71c89024981ec2539f4f56220e8d4029c895ca824ee' 
  AND token = 'XUkjzM6Bm20hqfKrJc4ztRo7Toy0DIKka5Vnv40E2eQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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