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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'db9ff15ddd130d4472dbbe1e11df29ac07b5e9ad0ab74dc7bf05db020676ee1b' 
  AND token = 'PIvZo5Ohww1soPY4nQUrzMU1y2aZOR3U3wEizPAYuUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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