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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a4797fbcb715c5b525b3c2bcc6d70d042a6aed2be9c190b2807db3eada0fd211' 
  AND token = 'wE3qT49RlptJ1YhFd5fU5NH1//wE5I1Szun7lVgBfZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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