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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '40d95b8c4b1bc1fcce215442539731e04a10e23bf759c82a5940096a272a06ad' 
  AND token = '/ymEQPb1RQPDtlGyCwvEM5rKUfhHox6qdfS6dhxPcmU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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