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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bea6dce183668db6671570ed5bfd3dc6f12fa3c176df201f507ea2e3025fe655' 
  AND token = '+eVbnNzBmpBxRHDt7SM8QhEuZzniih/wkQX11dHfnmk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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