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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e1ba71ff0c65f54a9d97b479546cb6c9b09dac17fa54ee48881393dbb75d0cba' 
  AND token = 'yM7rmOHA0bRm9Od4QfARI5LmqN0jt6U7R2h+y63g+Lo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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