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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6791ba1d17e0a9aa500a55ec86add2c01ae9740f6e1ff6df5ac6777499796818' 
  AND token = 'jOwZUNv7Tpl1shQDoxWLKH02aOEXCvdp0mRxWAjOnOM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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