SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '85fe7b479cc7a68c3d7535021591a001816af6e0875d172b2fa5d240ab5d20f5' 
  AND token = '+VTNzD4BXZNtWaluqsglNny8KISYxRvjP2ibM8Bm/6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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