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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8ed9515151c18a7bbec2376ebff0ae5a8324a206a0f2d5bfa36b5872d3bcf060' 
  AND token = 'rLkT5M3MX+zqB6yhNjVa9fevJm6mf+MubojyO9XFOiU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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