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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '934cb995ccc0d8ec46dfd6367486cd3c1587c146be4d19f51157427beb50ac5d' 
  AND token = 'J+k84mmo9jk3QCsXM3/l4xA/CD3N5Av8D9C0PJPVu6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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