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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f0ead204c793856fb1645e43e78fa4af0a0d6e239dbc834d85d0604d3c30b792' 
  AND token = 'w9/Xd32zgTBqKn7dvoqaBYTTEvMOXknBqWbtITAqmvc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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