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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '97143425522310c32b7ac7047f3c8c8010fba8402aed7e80da7b389f5fae9401' 
  AND token = 'gTb2A0pyVG+txOXyz8t/Y1XoQjY4vgVdwiNYkL2tNlA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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