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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '38387d6217c2aad35b909f68a7d032e3c609ec43c97821aee109c80015c3c611' 
  AND token = 'YWP0qiluUvMf3AnGtzyRRAE83a54V8hW8u+5rLKDvlQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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