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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f97934d475ddac8de8014e71f38bbfe4644ece30bf76a43769f7a0509ec59d91' 
  AND token = 'pjAPyOwUcicjCRZED8jfTeotokJMWbPc0WHmuZUrK6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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