SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1a09c296a28cbe13d91be04fb49bcd209274be2cf9289313c0eb5062518ec290' 
  AND token = 'sCc9Vp8YIvu6EJ+KHC//TPZgrmqQemkxfCSAV3iYsXs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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