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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b406e054fab2b5ce12a3f335ce05a437612c003c0413b82baf2adceec605e751' 
  AND token = '25Z5GBRVoLwx/IcYIpZ5cfW3zX9dfSQgsRwRA/7TcM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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