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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd9ff451328c9efef605c16d836a8dea1e3dd1f2d63219fdf1f0660b4df372cb0' 
  AND token = 'GVt8o4r7tIPlr82Scw/rbm0Ve/G7P591dQIzmBIQy8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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