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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c30290e64927470ee64b0675998edc2a3e4dec0467f4f30e0a775c11fb86a443' 
  AND token = '5gMQiGbHbnyRyKG7iuzxVrF/WjAot7Ccq6Bu7ssyNkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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