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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2293f837c0c94e87de65f52c58347a875e48fcca31be427a2a4570b86e133e70' 
  AND token = 'Z6u/cODVP/Xq3j5d64LR2p26aVeAT+MX4fOawUizvnc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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