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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c28257339275c9f87d1a80b3c47d4ac78acc4c7366fd4275bfb714ccc27f9229' 
  AND token = 'WaAlvTX4MwC9pxZK3cOeJ2QXlODbxByLlJ+2lMV/hJs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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