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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '39379cab03c11d4b75db8ff73fe3dec055e721ad18181eff06fc2d24af9b9669' 
  AND token = 'kzizU8qvSDbT1pbNmb5tr97Tfjlt25fxHlO4NHUoKe0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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