SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'aa21571602cfe4b0547a64f1765daba7bfe7a83b7583692649828fee0bc923d2' 
  AND token = 'aCgjO18FLg8Fyx5ZF5HbxKYI28Xl232VBBnLK3ZjKAU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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