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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '13e49783a308b832ab0b575815b489c7ac4efda6869286077444f95a3c50f852' 
  AND token = 'ysJ4bD3dn1k9sZoavF+/EiRxlTTwBch8qWObRb5fQow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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