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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2623e0c11b7276c479341ac24c2ef00e1af63956c3a5a69333da611f5a23083f' 
  AND token = '3VkY8pG9XRQ5hKylHrIWqWK1FfV52bVwcR9ik0/fB/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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