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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1becce5d6eeec8463e4f0c890f81ebfc273b9f96d93e4cbc96df484c227e15d7' 
  AND token = 'wIx1LE7yPM+sFRFPLSHjBMAFv6DApTbAnLBjRVNUqSM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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