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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '41dc4fb1f08338c475ad7c711beb660c870df9ee18b68ccb0e297b2b8060685e' 
  AND token = 'XzNGacYFmlb3qHy6sPc/6Hfnupj4/jj11UW1BGHfvS8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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