SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd485dc2d5e8f16e4df6193aac0b9123b55a928d8b0d7179297dc8f1b0a9ef1c0' 
  AND token = 'sFxJ1hIm+Z8v2lpMVl24Ocfzh4ZVz9tUTHdpiAwpGFM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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