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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ba67151733b07cd1494f73cf18329fc8351152cae2d85dc7dda63c2526adf21d' 
  AND token = 'H5P64mYYETC2rbvIQ3ECgfzN0310D0DZJP5GtWMUIxY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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