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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '822d836c88bc03b106368a432478e09dfe7f11ab30484fdd05d1684ea27e899f' 
  AND token = 'OMd4RWz8O6cdvCYxl8CqR9GuaTy68A9WF+yx/HEVxsU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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