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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '39e05b8c844f98b0ec01c9763488294d41d54ec2fb5fe45a635bc32e77cfe764' 
  AND token = 'CI69b1J7AZYxgjyO5docw3QKOwSm6/q3k6TZ9o6KpwI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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