SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '33cf646a2a5c7977a5872e024bc5dd35a6d63d63e59b7128babb795a0ea673c3' 
  AND token = 'cgESGafF6TVIEsK2XoqXFNQKFhgYBR/IQ8UaqJwz2hg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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