SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4b5bf2b8e4b46058c0d4474964b3d3549af559ed7a448e4dfa8d508a150a23a0' 
  AND token = 'QRZwzlCvNCbCm8LYqW1RiuSjhz7nabKRGZAP+96kLgo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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