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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3e5ef32f58907c20db43ea0cd4ec39b5cca1c10af66ef621728883fc4790b51b' 
  AND token = '1awzFbh2u3v+NOGfwu/FD3XpLitz2UtiXvXfaGEw7Xs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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