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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '41ff32a615b652d858af92e72c2a075f2479d5980add903e521f09b79d0b4294' 
  AND token = 'jeiSzceFxS5G7Znau/lihYsTwBBAlYNrIlD10u4ZWec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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