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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd4e18637aeb25f88c033b00cf145ef3a083df43deba444761b0c702564841e3c' 
  AND token = 'mG91fI37cQWkVLMyiVl82Qhf82QOfPnI/Go9ArN7XEo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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