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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '05b7f95dc6b3cbc4137e5be7e7d57f18963bf0ec27d91aa9390d41d5af82ab6f' 
  AND token = 'cKtB8/WQRqCfnrpMT7MAuAgdQEYC+fxiT9/i9accjAU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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