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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '20e54800c84ac89ecf8f45dadb29fb082a3e110fde0318b0273edf9e508b5d55' 
  AND token = 'IQLgB0YkTV8a8vkuIxSAhriHQyhNt+Sj1svOCuPRqTk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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