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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5d11de143f7dab0062834f95ba0aeed79e9be7be64510c5fc097c534c436ef4d' 
  AND token = 'x2obZNDcTWLe6ZUl7EkLl4RSN4fGyk97gWjinUy68ic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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