SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '22fc35c737a73642a5369b38149ab093cf6a429bfc8271ea7b3c40f38458d5c8' 
  AND token = 'ZmxKO6OB1JZcCvyjIm1uowd7zfU5bPCRRH8f1cTakg8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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