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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '81d1d5c2ec2b5095ec2d2dc584780522627ca3ecbe6c41e8099c7eb3f234d07c' 
  AND token = 'UHP6jU6M96S3IjX4Fa4pB81oBZEzpY/xo6WxepGnUWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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