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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ca021bca06322e81a6d74e97ae7ff4ea843182d9ea053b09cf698f90554a3cc7' 
  AND token = 'r2hqf0XDfHHtjYu4a1HCLYPyuZjZacPtjD5nnQNaO5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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