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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f0e527ecfd037134e04948033135dca5f941c554c7bed0d3e321186dd4b17b75' 
  AND token = '+OGo8R05onCd8fRMos7IqZudvkMnMNHbJ41gNPxKg2Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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